Buttonhole-sewing machine.



J. T. HOGAN. BUTTONHOLE SEWING MACHINE APPLICATION FILED MAY 4, 1911.

1,085,9 1 O. Patented Feb. 3, 1914.

' 4 SHEETS-SHEET 1.

S I K I I I WITNESSES:

J. T. HOGAN.

BUTTONHOLE SEWING MACHINE.

APPLICATION FILED MAY 4, 1911.

Patented Feb. 3, 1914.

4 SHEETS-SHEET 2.

INVEN'TOR 7,

ATTOR N EYS J. T. HOGAN.

BUTTONHOLE SEWING MACHINE.

v v APPLICATION FILED MAY 4, 1911. 1,085,910. v Patented Feb. 3, 1914.

4 SHEETS-SHEET a.

WITNESSES:

J. T. HOGAN.

BUTTONHOLE SEWING MACHINE.

APPLIOATION FILED MAY 4, 1911.

1,085,910. Patented Feb. 3, 1914.

4 SHEETS-SHEET 4.

-INVENTOR ares rarest memo- JAMES '1. Room, or JERSEY CITY, new JERSEY, assren'on TO THE smear. NU-

FACTUBING commas, or ELIZABETH, new JERSEY, a co 2 oaarron or new JERSEY.

BUTTONHOLE-SEWING MACHINE.

Specification of Letters Patent.

Patented Feb. 3, 131%.

To all whom it may concern Be it known that I, JAMES T. HOGAN, a citizen of the United States of America, and a resident of Jersey City, county of Hudson, and State of New Jersey, have invented certain new and useful Improvements in Buttonhole-Sewing Machines, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof. 7

My invention relates to buttonhole sewing machines of the type designed for producing buttonholes with side stitches upon either side thereof, and barring stitches of igreater amplitude at the ends of the buttonole, such barring stitches being substantially parallel with the side stitches.

I have found by experience that where the barring stitches are formed while there is'a relative longitudinal feed between the work and the stitch forming mechanism, a slight gap in the stitching is apt to result at the point where the side stitches connect with the barring stitches. This is not, only unsightly, but leaves a weak place in the buttonhole.

The present object of my invention is to avoid such a gap, and to this end I so design and construct the machine as to cause the longitudinal feed of the work clamp, by which the work being operated upon is sup- Y ported, to be suspended for a brief space of time, at just the point at which the barring and side stitches merge into each other. By thus suspending the feed I crowd the stitches slightly at these points and so obviate any possible chance of there being a gap.

In the particular embodiment of my invention shown herein the work clamp feed is produced by a substantially heart-shaped cam, and to procure the desired result I provide short concentric portions or dwells in the cam at the proper points therein. thereby modifying the shape thereof from the true heart-shape to a special form wherein the feed instead of being continuous will be suspended temporarily at the proper intervals for the desired purpose.

In order that my invention may be fully understood, I will now proceed to describe an embodiment thereof, having reference to the accompanying drawings illustrating the same, and will then point out the novel featuresin In the drawings: Figure 1 is a view in partial side elevation and partial longitudinal vertical section of a machine in which my invention is employed. Fig. 2 is an underside view of the same. Fig. 3 is a detail transverse sectional view therethrough upon the line 3--3 of Fig. 2. Fig. 4: is a detail top view of certain parts thereof with the diagrammatic view of the stitching of a buttonhole made upon the machine herein illustrated.

' The machine, in general, comprises the usual bed plate 10 and overhanging arm 11. Mounted in the upper arm is the usual main driving shaft 12 which operates to reciprocate the needle bar 13, and through a cam 14 and certain correlated parts produces lateral or jogging movements of the needle bar necessary for the production of the stitches.

Supported upon the bed plate of the machine is the carrying plate 15 for the work clamp 16. This carrying plate 15 is mount ed upon a supporting plate 17. with respect to which it may have a limitedlongitudinal movement, suitable guides 18 being provided for defining su'ch movement. The supporting plate 17 is similarly guided transversely in the machine by guides 19 whereby it, together with the parts supported thereby, may have a limited transverse movement in the machine.

Mounted immediately beneath the bed plate and upon a stud 20 as an axle, are cams 21-22 for imparting feed movements and lateral shifting movements respectively to the work clamp, and a ratchet wheel 23 through which movements of rotation are proaches nearer to, or departs farther fromits axis of rotation, it swings the bell crank lever 25-27 about its axis 26, and so imparts a longitudinal feeding movement in no one direction or the other, i. 0., either forward or backward, to the work clamp carry ing plate 15, and hence to the work clamp. The shifting movements necessary to transfer the work between the positions to receive side stitches along one side thereof and upon the other, and an intermediate position to receive barring stitches, is effected by means of the cam 22, which cam engagesa stud 29 carried by the arm 30 of a bell crank lever which is pivoted about a stationary axle 31 also secured to the bed plate of the machine, the other arm 32 of the said bell crank being connected by means of a stud 33 with the supporting plate 17 The movements of the bell crank lever 30-32 about its axis caused by the cam 22, will move the supporting plate 17 transversely in the machine between the guides 1919 so as to produce the proper lateral shifting move ments for the purpose above described, as will be well understood.

The step by step movements of rotation which as has been stated, are transmitted to the cams 21-22 through the ratchet wheel 23, are imparted to the ratchet wheel by means of the usual pawl 34 and pawl carryingplate 35 to which oscillating movements are imparted by means of a cam or eccentric 36 upon the vertical shaft 37, the said cam or eccentric engaging a rocking lever 38, one end of which is connected through a link 39 with the plate 35. The vertical shaft 37 is driven by the main shaft as is usual. Secured to the feed wheel 23 is still another cam 40 whose function is at the required moment to so operate upon the stitch forming mechanism as to increase the amplitude of the jogging or lateral movements of the needle bar at the proper moment for the production of barring stitches. This cam operates through a lever 41 and a link 42 upon a pivoted plate 43 whose angular position defines the length of movement of the jogging stitches imparted. the construction and position of the (am 40 being so designed with respect to the constructionhnd )OSltimi of the cams 21 and 22 that the arring stitches will be produced at the time the work is being presented by the work clamp to the needle, at the opposite ends of the buttonhole.

Further detail description or illustration ter understanding of that portion of the machine which does contain my invention.

The relative positions of the work'clamp necessary for the production of the buttonhole, will be better understood by reference meaeio to Fig. 8. Tu this figure 44 represents the side stitches upon one side of the buttonhole, 45 the side stitches upon the other side of the buttonhole, 46 the barring stitches at one end of the buttonhole, and47 the bar ring stitches at the other end of the buttonhole. The feed wheel 23, together with the cams carried thereby, makes one complete revolution for each buttonhole produced, and when the high portion 48 of the cam 22 is reached the work clamp is moved to the right as shown in the drawings, to so position it with respect to the stitching mechanism that the stitches 44 on the left of the buttonhole will be formed. The change to the lower portion 49 of the cam shifts the work clamp to the left as viewed in the drawings, whereby the work clamp will be positioned with respect to the stitching mechanism to receive the side stitches 45, while the movement to the intermediate portions 5050 of the cam 22 will bring the work clamp to an intermediate position wherein the barring stitches will be formed. The feed cam 21 has a portion 51 which rises continuously from the point therein nearest to the axis of rotation of the cam, to the point therein farthest away from such axis of rotation, and it has another portion 52 which drops from the highest to the lowest point, but not, however, continuously. This latter part 52 is interrupted at two points 5354, at each of which points there is a dwell, that is to say,the cam at each of the two points 53 and 54 is concentric for a short space. I refer to Fig. 7 for a diagrammatic layout of the said cam upon an enlarged' scale. This cam may be read in connection with the diagrammatic view Fig. 8, with the following understanding of Fig. 8.

The work commences in Fig. 8 at the point I, and continues uninterruptedly throughout the whole length of the butt-onhole, to

the point II, thereby producing the side" stitches 44 for the entire length of one side of the buttonhole. Thereafter the end barring stitches 46 are formed ending at the point TH. Between the point III and the point VT, the side stitches 45 are formed, and thereafter the end barring stitches 47 are formed whereby the buttonhole is completed. The portion of the cam diagram in Fig. 7 between the radial line I and the radial line Ill, (being the portion designated by the reference character 51 in Fig, 6,) represents the movement of the work in the production of the side stitches 44 shown in Fig. 8, wherein the work moves from the polnt I to the point II. The barring stitches 46 are formed upon the first portion of the return movement of the work, and the por made from barring to side stitches, thereis a dwell portion of the feed cam represented between the radial lines III and IV in Fig. 7, the corresponding positions in the buttonhole diagram Fig. 8 also being desi nated by the reference characters III an IV. This suspends the feeding movement of the work at the commencement of the formation of the side stitches, thereby crowding the side stitches at the termination of the barring stitches and preventingany undesirable gap being formed. The work clamp from this point is now fed continuously until just before the barring stitches 47, at the opposite end of the buttonhole, are reached, this portion of the feed being represented between the radial lines IV and V in the diagrammatic view Fig. 7. Thereafter the feed is again suspended for a dwell defined by the movement of the cam between the radial lines V and VI, whereby side stitches are crowded just at the point at which they merge in with the end barring stitches. and thereafter the end barring stitches are formed during a progressivefeeding movement of the work clamp represented as between the radial lines VI and VII in the diagrammatic view Fig. 7. In the cam shown there is a slight dwell between the .point'VII and the point I, but this merely represents a slight dwell between the completion of one buttonhole and sult. no extra cam or cams or other parts.

the commencement of another.

By providing the feed cam with the two dwells at the proper points whereby the longitudinal feeding movements of the work is suspended at the time the transitionis made from side to end stitches, or end to side stitches. any possible gap at this point is avoided. the buttonhole is strengthened, and unsightliness in this connection is avoided. It will also be seen that by constructing the feed cam in the manner hereinbefore set forth I provide an exceedingly simple mechanism for. accomplishing the rebeing necessary to produce the result, the only change from the ordinary machine being a slight change in the shape of the cam 21.-,

As will be evident from the foregoing de- I scription, the independent actuation of the needle-jogging cam 14 and the feed-cam 21 at the points where such gaps would other-' wise occur.

What I claim is: r I v 1. In a buttonhole sewing machine, the combination with stitch-forming mechanism including areciprocating needle, a workcla-mp; means for producing relative jogging movements between the needle and work-clamp, and means for periodically varying the amplitude of said jogging movementsto change the length of the consecutive stitches. of means for imparting longitudinal feeding movements to the work- 'clamp and for temporarily suspending such feeding movements intermediate the extreme positions of the work-clamp and immediately prior to the change in amplitude of said jogging movements.

2. In a buttonhole stitching machine, the combination with stitch-forming mechanism including" a reciprocating needle, of a workclamp, means for producing relative jogging movements between said needle and work-clamp and means for periodically,

varying the length of said jogging movements, thereby to produce a series of buttonhole side-stitches and a series of barring stitches of greater length. and means for producing a series of piled up or relatively massed side-stitches and acting atpoints of change in the length of said jogging movements.

3. In a buttonhole .sewing machine, the

combination with a reciprocating and laterally jogging needle, needle-jogging means. and awork-clamp, of a cam adapted to impart longitudinal feeding movements to the work-clamp and having dwell portions for temporarily suspending such feeding movements intermediate the extreme positions of the work-clamp, actuating means for said cam including an adjustable element whereby the speed of movement of'said cam may be varied independently of the needle-jog. ging means, and means acting upon the needle-jogging means during. the control of the clampby said dwell portions of said cam for varying the amplitude of jogging movements of the needle. JAMES T. HOGAN. Witnesses HARRIS W. SLATER,

DANIEL J. TROY. 

